Transferrin saturation

Transferrin saturation, abbreviated as TSAT and measured as a percentage, is a medical laboratory value. It is the ratio of serum iron and total iron-binding capacity. Of the transferrin that is available to bind iron, this value tells a clinician how much serum iron are actually bound. For instance, a value of 15% means that 15% of iron-binding sites of transferrin are being occupied by iron. For an explanation of some clinical situations in which this ratio is important, see Total iron-binding capacity. The three results are usually reported together.

Usual values

Normal reference ranges are:

Serum iron: 60–170 μg/dl (10–30μmol/L)
TIBC: 240–450 μg/dl
Transferrin saturation: 15–50% (males), 12–45% (females)

μg/dl = micrograms per deciliter.

Laboratories often use different units and "normal" may vary by population and the lab techniques used. Look at the individual laboratory reference values to interpret a specific test (for instance, your own).

Reference ranges for blood tests, comparing blood content of iron and related compounds (shown in brown and orange) with other constituents.

Reference ranges for blood tests (CPT 82000–84999)

Electrolytes	Sodium Potassium Chloride Calcium Renal function Creatinine Urea BUN-to-creatinine ratio Plasma osmolality Serum osmolal gap

Acid-base	Anion gap Arterial blood gas Base excess Bicarbonate CO₂ content

Iron tests	Ferritin Serum iron Transferrin saturation Total iron-binding capacity Transferrin Transferrin receptor

Hormones	ACTH stimulation test Thyroid function tests Thyroid-stimulating hormone

Metabolism	Blood lipids

Cardiovascular	Cardiac marker Troponin test CPK-MB test Lactate dehydrogenase Myoglobin Glycogen phosphorylase isoenzyme BB

Liver function tests	Proteins Human serum albumin Serum total protein ALP transaminases ALT AST AST/ALT ratio Bilirubin Unconjugated Conjugated

Pancreas	Amylase Lipase Pancreatic lipase

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